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Finding the Fourth Proportional to 76,985.80, 115,478.70 and 50,720.20

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Solution

The fourth proportional to 76,985.80, 115,478.70 and 50,720.20 is: 76,080.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,985.80 : 115,478.70 = 50,720.20 : x
  2. Step 2: Convert to fraction form
    76,985.80/115,478.70 = 50,720.20/x
  3. Step 3: Cross multiply
    76,985.80x = 115,478.70 × 50,720.20
  4. Step 4: Simplify right side
    76,985.80x = 5,857,102,759.74
  5. Step 5: Solve for x
    x = 5,857,102,759.74/76,985.80
  6. Step 6: Final answer
    x = 76,080.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.